Compile: virtual memory exhausted: Cannot allocate memory, exhaustedallocate

Compile: virtual memory exhausted: Cannot allocate memory, exhaustedallocate
I. Problems

When the system does not set the swap size or the memory size is too small when installing the virtual machine, the Compilation Program will encounter the virtual memory exhausted: Cannot allocate memory problem. You can use swap to expand the memory.

Ii. Solution

The prompt "Cannot allocate memory" is displayed when free-m is executed:

(Swap files can be stored in your favorite location, such as/var/swap)

 

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1. [Root @ Byrd byrd] # free-m
2. Total used free shared buffers cached
3. Mem: 512 108 403 0 0 28
4. -/+ Buffers/cache: 79 432
5. Swap: 0 0 0
6. [Root @ Byrd ~] # Mkdir/opt/images/
7. [Root @ Byrd ~] # Rm-rf/opt/images/swap
8. [Root @ Byrd ~] # Dd if =/dev/zero of =/opt/images/swap bs = 1024 count = 2048000
9. 2048000 + 0 records in
10. 2048000 + 0 records out
11. 2097152000 bytes (2.1 GB) copied, 82.7509 s, 25.3 MB/s
12. [Root @ Byrd ~] # Mkswap/opt/images/swap
13. Mkswap:/opt/images/swap: warning: don't erase bootbits sectors
14. On whole disk. Use-f to force.
15. Setting up swapspace version 1, size = 2047996 KiB
16. No label, UUID = 59daeabb-d0c5-46b6-bf52-108e6b05eb0b
17. [Root @ hz mnt] # swapon/opt/images/swap
18. [Root @ hz mnt] # free-m
19. Total used free shared buffers cached
20. Mem: 488 481 7 0 6 417
21. -/+ Buffers/cache: 57 431
22. Swap: 999 0 999

The memory size is too small. Increasing the memory size can solve this problem.

 

After use, you can turn off the swap:

 

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1. [Root @ hz mnt] # swapoff swap
2. [Root @ hz mnt] # rm-f/opt/images/swap

Swap files can also be deleted without being deleted and used later. The key is that your VM hard disk is sufficient.